106 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 16 



Material from Station 804-38 has calices with the columella almost 

 obsolete, represented by only a very few interlacing trabeculae from 

 deep within the calice; in material from station 331-33 the columella is 

 quite prominent and composed of numerous, fine, interlacing trabeculae. 



Most of the typical specimens appear from near shore or shallow 

 water localities while the ones with smaller calices and Astropsa?nmia- 

 like corallum appear to be representatives of deeper water. 



Van der Horst (1926, p. 47), has considered that T. aurea (Quoy 

 and Gaimard) and T. tenuilamellosa (Milne Edwards and Haime) are 

 identical. Durham (1947) separates the two species on the basis of the 

 finer costal granules on T. aurea. This problem should be reinvestigated 

 when large suites of each species are available for comparison. 



T. surcularis (Verrill) may be an exceptionally large individual of 

 this species. 



This species has been recorded from Panama; Pearl Islands; Aca- 

 pulco, Mexico; La Paz; Santa Isabella Island; the Galapagos Islands. 

 Depth, shallow water. 



Hypotypes: Cat. nos. 69.1 (Sta. 31-33), 69.5 (Sta. 155.34). 

 (1), 804-38 (1). Cat. nos. 69.1-69.10. 



Material examined: Stas. 31-33 (4), 48-33 (2), 69-33 (3), 152- 

 34 (4), 155-34 (1), 194-34 (5), 333-35 (frag.), 465-35 (3), 796-38 

 (1), 804-38 (1). 



Distribution: Sta. 465-35 is at Playa Blanca, Costa Rica, shore; 

 the other stations are in the Galapagos Islands, shore to 60 fms. 



